The Energy Efficiency of Shutters

According to the Department of Energy (energy.gov), about 30% of a home’s heating energy is lost through windows. Window coverings, including interior shutters, can reduce energy loss and help to lower heating and cooling bills. In addition to window treatments, storm windows are effective at reducing solar heat gain and improving thermal performance of windows.

There is often a presumption that old is bad and new is good; this is not necessarily so. Historic buildings have demonstrated their sustainability by withstanding over time. The same is true for historic window treatments…shutters can provide a 58% reduction in heat loss in single pane windows and a 62% reduction with insulated glass. (Historic England) Shutters help to limit downdrafts and reduce radiation losses.

Wood shutters offer better insulation performance than hollow or composite shutters. They provide an insulative barrier to maintain your desired room temperature while looking elegant and polished no matter what your room style and furnishing. Raised or flat panel shutters will provide the most protection, with Brownstone shutters (a combination of louvered and raised panels) following closely behind.

People who have shutters installed in their homes state that they notice a difference in temperature after opening shutters after a period of closure. Customers have reported that they could feel the difference between the cold air trapped between the window and shutters and the warm air in the main space of the room. Some people even relate that they are able to turn down their heating or notice a lower heating bill after having shutters installed.

On the opposite end of the spectrum, shutters can block the sun and heat from entering your living space during the warm (summer/fall) months. Both interior and exterior shutters lead to lower electricity bills by effectively obstructing and absorbing solar heat. They also protect against harmful UV rays and harsh glare providing functional value in a pleasing presentation. Smaller louvers are more effective in blocking direct daylight (and heat or cold) but reduce your view due to the number of louvers; conversely, larger louvers are slightly less effective in blocking heat and cold, but offer a better view when open.